Piezoelectric actuator, optical reflection element using the same and piezoelectric driver

1. A piezoelectric actuator comprising: a first oscillating portion provided with a first piezoelectric element having a first drive electrode; and a second oscillating portion having a central axis different from that of the first oscillating portion and provided with a second piezoelectric element having a second drive electrode, wherein the first drive electrode and the second drive electrode are connected together.

2. An optical reflection element comprising the piezoelectric actuator of claim 1 , and a mirror linked with any of the first oscillating portion and the second oscillating portion.

3. The optical reflection element of claim 2 having the mirror linked with the first oscillating portion, the optical reflection element further comprising: a frame body linked with the first oscillating portion and surrounding the perimeter of the first oscillating portion and the mirror; and a support base linked with the frame body through the second oscillating portion.

4. A piezoelectric driver comprising: a first oscillating portion provided with a first piezoelectric element having a first drive electrode; and a second oscillating portion having a central axis different from that of the first oscillating portion and provided with a second piezoelectric element having a second drive electrode, wherein the first drive electrode and the second drive electrode are connected together, and a composite electric signal of at least two electric signals is supplied to the connected drive electrodes.

5. The piezoelectric driver of claim 4 , wherein the composite electric signal of at least two electric signals includes a first electric signal for driving the first oscillating portion and a second electric signal for driving the second oscillating portion, passed through respective impedance elements before being combined into the composite electric signal.

6. The piezoelectric driver of claim 4 , further comprising: a first saturation amplifier connected with a first preamplifier for receiving a first electric signal for driving the first oscillating portion; a first band-pass filter connected with the first saturation amplifier; a second saturation amplifier connected with a second preamplifier for receiving a second electric signal for driving the second oscillating portion; a second band-pass filter connected with the second saturation amplifier; and a combiner circuit for combining outputs of the first band-pass filter and the second band-pass filter, wherein the composite electric signal of at least two electric signals is supplied from the combiner circuit.